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trangle magnetic ruler / trangle ruler

trangle magnetic ruler
trangle magnetic ruler

“Trangle magnetic ruler”is a ruler connect with magnetic force;take apart for carry easily;also,it can give you
15° 30° 45° 60° 75° 90° to choose.

University

Huaqiao University

Huaqiao University
Xiamen, China

XiangZhou,
Huaqiao University

Xuqin Cai,
Huaqiao University

Huafeng Li,
Huaqiao University

Rui Wang,
Huaqiao University